Major Fatty Acid Compositions and Antioxidant Activity of Cultivated Paeonia ostii under Different Nitrogen Fertilizer Application

Abstract

Paeonia ostii is now being extensively planted for oil extraction in China, which is recognized as a single oiluse tree peony cultivar and commonly called 'Fengdan'. This study investigated the effects of nitrogen fertilizer on oil yield, fatty acid compositions and antioxidant activity of P. ostii. Oil yield (33.46 %), oleic acid (25.12 %), linoleic acid (29.21 %) and α-linolenic acid (43.12 %) reached the maximum at N450 treatment, with significant differences compared with other treatments (P < 0.05). Furthermore, strong antioxidant activity with low DPPH IC50 value (19.43 � 1.91 μg mL À 1) and large ABTS value (1216.53 � 30.21 μmol Trolox g À 1) and FRAP value (473.57 � 9.11 μmol Trolox g À 1) was also observed at N450. Palmitic acid (5.57 %) and stearic acid (2.02 %) reached a maximum at N375, but not significant with N450 (P < 0.05). Nitrogen fertilizer could promote oil yield, fatty acid accumulation and antioxidant activity, and N450 (450 kg ha À 1) is recommended as the optimum application for P. ostii.

Effects of Phosphorus Fertilization on Growth Characteristics, Fatty Acid Composition, and Seed Yields of Fengdan (Paeonia ostii T. Hong & J. X. Zhang)

“…However, with the increase of the amount of phosphate fertilizer, the content of total unsaturated fatty acids decreased, which may be due to the role of lipoxygenase, free radicals, and reactive oxygen species (Xu and Zou, 1993). Previous reports also showed that compared with other vegetable oil varieties on the market, the content of unsaturated fatty acids beneficial to human body in P. ostii seed oil was higher (Liu et al, 2020). Therefore, rich a-linolenic acid in P. ostii seed oil has attracted more and more attention.…”

“…In consideration of the lighter color of P. ostii seed oil, the degumming and decoloring procedure was cancelled. The extraction was carried out under the conditions of 30 L•h À1 traffic volume, 35 C and 30 MPa pressure time, after 60 min, and the extraction efficiency reaches 98.2% (Liu et al, 2020).…”

“…It is endemic to China and has an ornamental cultivation history of more than 2000 years (Cui et al, 2016). Among the nine species of tree peony, Paeonia ostii T. Hong & J. X. Zhang was predominantly approved as a new oil-use resource by the China State Food and Drug Administration in 2011 as strong seed setting capacity and high oil yield (>22%) (Liu et al, 2020). P. ostii has a star-shaped fruit with dark oval seeds characterized by abundant unsaturated fatty acids (>90%) and a high proportion of n-3 fatty acids, which can prevent many diseases (Wang et al, 2019;Wei et al, 2016;Zhang et al, 2016).…”

Solvent polarity dictates the anti‐inflammatory potency and mechanism of two purslane ( Portulaca oleracea ) seed extracts

“…This might also elucidate the reason why plant extracts of high polyphenolic content do not often reflect a significant total antioxidant capacity in phosphomolybdate reduction assay. In the context of this study, the fixed oil extract’ major composition included linoleic acid (43.2%), oleic acid (24.49%), and palmitic acid (26.26%) that were recently reported as potent antioxidants (Liu et al, 2020; Yang et al, 2020).…”